Cylinder-grinding machine



June 19, 1928.

. W. B. SNYDER CYLINDER GRINDING MACHINE Filed April 21, 1921 2 Sheets-Sheet 1 mokins.

June 19, 1928.

4 W. B. SNYDER CYLINDER GRINDING MACHINE Filed April 21; 1921 flrayfli 2 Sheets-Sheet 2 Qua-M6.

INVENTUI? A TTORNEYS.

Patented June 19, 1928.

UNITED STATES PATENT OFFICE.

WILLIAM B. SNYDER, OF NEW YORK, N. Y., ASSIGNOR TO THE AUTO-HONE COMPANY,

OF BUFFALO, NEW YORK, A CORPORATION OF NEW YORK CYLINDER-GRINDING MACHINE.

Application filed April 21, 1921. Serial No. 463,099.

This invention relates to cylinder grinding or lapping tools for internal cmbustion engines, one object of the invention being to provide a portable and semi-manually operated tool by means of which the cylinders of an engine can be ground with the engine on its bed or the chassis of a motor vehicle, thereby eliminating the trouble and expense of removing the engine from its bed and placing it in a grinding machine as has been heretofore necessary.

Further objects of the invention are to provide a novel and improved rotary motor driven tool of the character described which can be manually operated and reciprocated within a cylinder from the head end thereof with the engine in normal position on its bed or chassis; to provide a cylinder grinding tool which automatically centers itself in a cylinder thus eliminating the necessity of extensive and accurate adjustments to ensure accurate grinding; to provide a tool having a body portion and a plurality of radially arranged grinding elements yieldingly influenced outwardly to engage the cylinder walls, and of a length greater than the piston stroke of the motor to be re-ground, said tool being adapted to be axially revolved and longitudinally reciprocated within the cylinder; to provide a cylinder grinding tool including novel and improved meansfor adjusting the grind-' ing elements for use with cylinders of variporting the tool on the engine and mechanically revolving and reciprocating the grinding elements within the cylinder, and to obtain other results and advantages as may be brought out by the following description.

Referring to the accompanying drawings, in which like numerals of reference indicate the same parts throughout the several views,

Figure 1 is a side elevation of a valve grinding tool constructed in accordance with my invention;

Figure 2 is a vertical longitudinal sectional View through the same;

Figure 3 is an end view of the lower end of the tool;

Figure 4 is a transverse sectional view taken on the line 4-4 of Fig. 21;

c Figure '5 is an inside elevation of the upone diameters; to provide means for sup-.

per end plate which receives the universal joint for driving the tool;

Figure 6 is a perspective view of one of the adjustable stop plates for holding the abrasive strips against displacement from the body portion and used in connection with the upper end plate;

Figure 7 is an inside View of the lower end plate;

Figure 8 is a perspective view of one of the keeper members used on the lower end plate;

Figure 9 is a perspective view of one of the abrasive strips;

Figure 10 is a perspective view of one of the llner strips; 7

. Figure 11 is a fragmentary perspective view of a modified form df abrasive strip, and

Figure 12 is a side elevation of the cylinder grinding tool showing mechanical means for reciprocating the same in an engine cyh inder, the tool being shown in position wi in the cylinder which is shown in cross-section.

In the embodiment of my invention shown in the drawings, the reference numeral 1 designates the body portion of the tool which is substantially cross-sha ed in cross-section and provided with a longltudinal recess 2 for lightness in construction, one end of the recess being closed as at 3. The body portion is substantially longer than the cylinder in which it is intended to be used, or at least longer than the piston stroke so as to bridge the worn area of the cylinder, and is formed with a plurality of longitudinally extendin radially arranged ribs 4 which are forme with longitudinally extending grooves 5 to receive abrasive strips or lap elements 6. The body portion 1 is preferably formed of some "light metal, such as aluminum, or wood, and I may utilize liner strips 7 of various widths in the sides of the grooves 5 for bearings and. guides for the abrasive strips 6 for a purpose hereinafter described, the said liner strips being secured within the grooves by means of screws 8.

T e abrasive strips are preferably formed of carborundum or like cutting material and in Figures 2 and 4 are shown as substan- 10! tially rectangular in cross-section and having their outer sides projecting beyond the ribs 4. The strips 6 are normally influenced outwardly toward the ends of the ribs 4 by a plurality of springs 9 arragned diametrically of the body portion 1 with their opposite ends engaging the inner sides of diametrically opposite abrasive strips, the said springs being housed within tubes 10 extending tranversely through the body portion 1, as shown in Figures 2 and 4, the said tubes ensuring smooth action of the springs and preventing buckling thereof. For the purpose of limiting the outward movement of the abrasive strips 6 under the influence of the springs 9 I provide means at the end of the body port-ion adapted to overlap the ends of the abrasive strips. At one end of the body portion I may provide a cross-shaped plate 11 secured to the closed end 3 of the recess 2 of the body portion by means of a screw 12, the said plate being provided on its inner side with a plurality of grooves or guide-ways 13 to receive adjustable keeper members 14, the keeper members being secured in said guideways by means of set screws 15. The keeper members are rovided with flanges 16 which are adapte to overlap the notched ends 17 of the abrasive strips as shown in Figure 2 of the drawin s, and the keeper members 14 are adjusta e radially of the end plate to vary the extent of movement of the abrasive strip 6 outwardly of the grooves 5. For this purpose the keeper members 14 may be each provided with an elongated openin 18 adapted to receive the set screws 15. it the opposite end of the body portion I provide a plate 19 similar in shape to the plate 11 and rovided with a central boss 20 adapted to t within the end of the recess 2 in the body portion and receiving a pin 21 extending transversely through the body portion and the boss, as shown in Figure 2, the said pin serving to connect the end plate to the body portion. A plurality of screws 22' may also be provided for securing the plate 19 to the body portion, the said screws passing through the plate and into the end of the body portion, as shown in Figure 3. The plate 19 is provided on its outer side with a plurality of radially disposed grooves or guideways 23 which receive keeper members 2 1 similar to the members 14 and provided with flanges 25 to overlap the ends 17 of the abrasive strips. The keeper members 24 are also adjustable radially of the end plate for the same purpose as are the keeper'members 14, by means of-screws 26 passing through slots 27 in the keeper members into the end plate 19,.as clearly shown in Figures 2 and 3.

In the operation of the tool the keeper members 14 and 24 are adjusted so that the distance between the outer faces of the diametrically opposite abrasive strips is slightly greater than the diameter of the cylinder wh ch it IS desired to ind. The abrasive strips are then forced inwardly of the body portion by means of the hand of the operator or a band slipped over the end of the tool until the tool can be slipped into the head end of the cylinder, it being understood that the cylinder head has been previously removed. The tool is then rapidly revolved within the cylinder and given short longitudinal reciprocations. For the purpose of revolving the tool I may provide the end plate 11 with a pair of spaced upstanding cars 28 to which is connected a universal joint 29, substantially in the plane of the upper end of the body portion, as shown in Figure 12, the said universal joint being connected to a drill chuck or the like such as indicated at 30 on Figure 12, which is secured to the shaft of an electric motor 31. The operator stands upon the engine holding the motor 31 in his hands, and raising and lowering the same in a vertical plane with short motions. This causes a reciprocation of the tool in the c linder, and this reciprocation in combination with the rapid revolutions of the tool produced by the motor 31 will cause the abrasive strips 6 to grind away the walls of the cylinder. The abrasive strips are constantly influenced outwardly into engagement with the walls of the cylinder so that the tool automatically centers itself within the cylinder, the grinding being thus extremely accurate without the necessity of extensive and troublesome adjustments such as has been necessary heretofore in the grinding of engine cylinders. The universal joint 28, 29 allows for the swaying of the motor or the operator during the reciprocation of the tool and also the vibrations of the body portion in the cylinder, without in any way affecting the proper centering or o eration of the tool in the cylinder, and t is is one important feature of the invention which permits of the use of a portable and semi-manually operated tool of this character. Further, the utilization of abrasive strips or lap elements of lengths greater than the piston stroke ofthe motor being re-ground, permits the re-grinding of the areas of the cylinder at the opposite ends of the worn area caused by reciprocation of the piston before the worn area is ground, thereby ensuring an accurate axial and uniform re-grinding of the cylinder walls. It is unnecessary to remove the engine from its bed or chassis so that the cost of cylinder grinding with my tool is greatly reduced.

To prevent the abrasive strip 6 from being broken as the tool is withdrawn from the cylinder due to tiltin the tool sidewise, I provide the lower en of the tool with an extension which is adapted to engage the walls of the cylinder upon a slight tilting of the tool to limit further tilting thereof and protect the abrasive strips.

In the drawings I have shown the keeper .ing the tool.

Levaeee member 24 provided with extensions 32 projecting longitudinally of the body portion, the said extensions engaging the walls of the cylinder when the tool istilted sidewise so as to hold the tool in a substantially vertical position until it is completely removed from the cylinder.

Wher solid abrasive strips such as shown in Figure 9 are utilized it will be seen that only the two exposed longitudinal edges thereof will serve in the grinding operation, and that as soon as these edges wear off it is necessary to cut the abrasive strip so as to produce other cutting edges. To overcome this difiiculty I may utilize an abrasive strip 33, as shown in Figure 11, the said strip being channel-shaped in cross-section and having its arms 34 projecting outwardly, the longitudinal edges of said arms providing four cutting edges. The arms of the strip may be reenforced against breaking under the pressure of the revolution of the tool by means of a wood or like strip 35 arranged between the arms and spaced a short distance from the outer edges thereof.

While the tool can be successfully manually reciprocated -within the cylinder, I contemplate the provision of mechanical meansfor supporting the tool within the cylinder and reciprocating the same, one possible mechanical means being shown in Figure 12. The reference character 36 designates a plate adapted to be secured to the head end of the cylinder by bolts 37 passing through the bolt holes by which the cylinder head is fastened in position, the said plate being provided with an opening 38 slightly larger in diameter than the cylinder. A vertical bracket 39 is secured to said plate 36 in any suitable manner as by means of bolts 40, and is provided at its upper end with a clamp ll, for supporting the electric motor 31.. The universal joint 29 has rigidly secured thereto a shaft 42 which has a keyed connection with a guiding socket 43 secured to the shaft of the motor by the drill chuck 30. The shaft 42 has secured thereto a grooved collar l4 which is adapted to receive the arms d5 of the forked end of an operating lever 46 pivoted intermediate its ends at l? on said vertical support 89. To reciprocate the tool within the cylinder it is merely necessary to oscillate the lever 46, the shaft 42 being thus reciprocated within the guide socket 41.3 and through its connection with the universal joint 29 reciprocat- The tool is adapted for use with cylinders of various diameters, the adjustable keeper members 14 and 24 allowing. adjustment of the abrasive elements 6 radially of the body portion 1 to vary the diameter of the tool. The liner strips 7 serve as guides for the abrasive strips and when it is desired to adjust the abrasive elements outwardly of the body, portion beyond the edges of the ribs 4 to increase the diameter of the tool,

.1 utilize wider liner strips 7 which project beyond the edges of the ribs a sufiicient distance to guide the abrasive elements and hold.

,them in position.

tion of the invention without departing from the spirit or scope thereof. Therefore, I do not desire to be understood as limiting myself except as required by the following claims when construed in the light of the prior art.

Having thus described the invention, what I claim is:

1. A. tool of the character described including a body member, an abrasive element extendmg longitudinally of said body mem her and of a length greater than the piston stroke of the motor the cylinder of which is to be re-ground, means for normally nfluencing said abrasive element outwardly of said body portion, and means on said body portion to prevent tilting of the body portion as it is applied to or removed from a cylinder to protect said abrasive elements against being broken by engagement with the edges of the cylinder.

2. A tool of the character described 1ncluding a body portion, an abrasive element on said body portion, said body portion being provided with an'extension beyond one end of said abrasive element to engage the walls of a cylinder to prevent tilting of said body portion as it is applied to and removed from a cylinder, and means for normally influencing said abrasive element outwardly ct said body portion.

3. A tool of the character described including a body portion, a plurality of radially arranged abrasive elements mounted in said body portion, means for influencing said abrasive elements outwardly of said body portion, said body portion being adapted to be inserted in a cylinder with the said abrasive elements engaging the walls thereof, and means on said body portion for preventing tilting of the same as it is withdrawn from the cylinder.

l. A. tool of the character described including a. body portion, a plurality of radially arranged abrasive elements mounted in said body portion, said body portion being adapted to be inserted in a cylinder, means for forcing said abrasive elements yieldingly into engagement with the walls of said cyllllll inder, and means on said body portion extending beyond the inner ends of said abrasive elements for limiting tilting of the body portion as it is withdrawn from the cylinder.

5. A tool of the character described including a body portion, a plurality of abrasive elements mounted on said body portion, resilient means for normally influencing said abrasive elements outwardly of said body portion, and means on said body portion engaging the ends of said abrasive elements to limit outward movement thereof.

6. A tool of the character described including a body portion having a plurality of radially arranged grooves extending longitudinally thereof for its full length in its periphery, an abrasive element mounted in each of said grooves to more radially of said body portion, means for influencing said abrasive elements outwardly of said grooves, end plates on said body portion closing the ends of said grooves to hold said abrasive elements against longitudinal movement, and members adjustably mounted on said end plates to limit outward movement of said abrasive elements and permit the extent of said movement to be varied.

7. A tool of the character described including a body portion, a plurality of abrasive elements radially arranged in said body portion, means for influencing said abrasive elements radiall outwardly of said body portion, said he y portion bein adapted to be inserted in a cylinder with t c said abrasive elements engaging the walls thereof, means for revolvin said body portion, a bracket to be secured to the head end of the cylinder and tixedl supporting said revolving means above th connecting said body portion to the revolving means so that the body portion can reciprocate simultaneously with its revolution, and means for reciprocating said body portion.

8. A tool of the character described including a body portion, a plurality of abrasive elements radially arranged in said body portion, means for influencing said abrasive elements radially outwardly of said body portion, said body portion being adapted to be inserted in a cylinder with the said abrasive elements engaging the walls thereof, means for revolving said body portion, a bracket to be secured to the head end of the cylinder and fixedly supporting said revolving means above the cylinder, means for connecting said body to the revolving means so that the body portion can reciprocate simultaneously with its revolution, and a lever pivoted intermediate its ends on said bracket and having one end thereof connected to said body portion for reciprocating the same.

WM. B. SNYDER.

e cylinder, a means for 

